added uint64_t compat file

CodeGenerator/StrExt.cs

@@ -14,6 +14,7 @@ namespace CodeGenerator {
                 "double" => typeof(double).AssemblyQualifiedName,
                 "string" => typeof(string).AssemblyQualifiedName,
                 "void" => typeof(object).AssemblyQualifiedName,
+                "ushort" => typeof(ushort).AssemblyQualifiedName,
                 _ => str
             };
         }